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  <section id="cpack-set-destdir">
<span id="variable:CPACK_SET_DESTDIR"></span><h1>CPACK_SET_DESTDIR<a class="headerlink" href="#cpack-set-destdir" title="Permalink to this heading">¶</a></h1>
<p>Boolean toggle to make CPack use <code class="docutils literal notranslate"><span class="pre">DESTDIR</span></code> mechanism when packaging.</p>
<p><code class="docutils literal notranslate"><span class="pre">DESTDIR</span></code> means DESTination DIRectory.  It is commonly used by makefile
users in order to install software at non-default location.  It is a
basic relocation mechanism that should not be used on Windows (see
<span class="target" id="index-0-variable:CMAKE_INSTALL_PREFIX"></span><a class="reference internal" href="CMAKE_INSTALL_PREFIX.html#variable:CMAKE_INSTALL_PREFIX" title="CMAKE_INSTALL_PREFIX"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_INSTALL_PREFIX</span></code></a> documentation).  It is usually invoked like
this:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>make DESTDIR=/home/john install
</pre></div>
</div>
<p>which will install the concerned software using the installation
prefix, e.g. <code class="docutils literal notranslate"><span class="pre">/usr/local</span></code> prepended with the <code class="docutils literal notranslate"><span class="pre">DESTDIR</span></code> value which
finally gives <code class="docutils literal notranslate"><span class="pre">/home/john/usr/local</span></code>.  When preparing a package, CPack
first installs the items to be packaged in a local (to the build tree)
directory by using the same <code class="docutils literal notranslate"><span class="pre">DESTDIR</span></code> mechanism.  Nevertheless, if
<code class="docutils literal notranslate"><span class="pre">CPACK_SET_DESTDIR</span></code> is set then CPack will set <code class="docutils literal notranslate"><span class="pre">DESTDIR</span></code> before doing the
local install.  The most noticeable difference is that without
<code class="docutils literal notranslate"><span class="pre">CPACK_SET_DESTDIR</span></code>, CPack uses <span class="target" id="index-0-variable:CPACK_PACKAGING_INSTALL_PREFIX"></span><a class="reference internal" href="CPACK_PACKAGING_INSTALL_PREFIX.html#variable:CPACK_PACKAGING_INSTALL_PREFIX" title="CPACK_PACKAGING_INSTALL_PREFIX"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CPACK_PACKAGING_INSTALL_PREFIX</span></code></a>
as a prefix whereas with <code class="docutils literal notranslate"><span class="pre">CPACK_SET_DESTDIR</span></code> set, CPack will use
<span class="target" id="index-1-variable:CMAKE_INSTALL_PREFIX"></span><a class="reference internal" href="CMAKE_INSTALL_PREFIX.html#variable:CMAKE_INSTALL_PREFIX" title="CMAKE_INSTALL_PREFIX"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_INSTALL_PREFIX</span></code></a> as a prefix.</p>
<p>Manually setting <code class="docutils literal notranslate"><span class="pre">CPACK_SET_DESTDIR</span></code> may help (or simply be necessary)
if some install rules uses absolute <code class="docutils literal notranslate"><span class="pre">DESTINATION</span></code> (see CMake
<span class="target" id="index-0-command:install"></span><a class="reference internal" href="../command/install.html#command:install" title="install"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">install()</span></code></a> command).  However, starting with CPack/CMake 2.8.3 RPM
and DEB installers tries to handle <code class="docutils literal notranslate"><span class="pre">DESTDIR</span></code> automatically so that it is
seldom necessary for the user to set it.</p>
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